Plum fruit

Plum Fruit (Prunus domestica L. / Prunus salicina Lindl.): A Comprehensive Reference

1. Identity, Botanical Classification, and Common Forms

Plum is a drupe fruit belonging to the subgenus Prunus of the family Rosaceae. It is one of the most widely distributed and cultivated fruit crops in the world, domesticated approximately 3,000 years ago, and is mainly categorized into two principal types: the hexaploid European plum (Prunus domestica L.) and the diploid Chinese or Japanese plum (Prunus salicina Lindl.). A third species, Prunus mume Sieb. & Zucc. (the Japanese ume or Chinese mume plum), holds particular significance in East Asian food and medicine and is closely related, though botanically distinct.

Plum is an edible fruit of genus Prunus and family Rosaceae, subfamily Amygdaloideae. The natural range of Prunus domestica extends across regions of Europe, Western Asia, and North Africa; however, it has been successfully cultivated in many parts of the world, particularly in North America, where it has become a staple in backyard orchards and commercial farms alike.

Prunus salicina Lindl. plums are cultivated mainly for the fresh fruit market, while Prunus domestica L. plums are used for the production of prunes. Both species display great diversity in shape, size, taste, and appearance of the fruits from different cultivars. In particular, various skin colors (yellow, red, dark purple) and flesh colors (yellow, red) occur.

Common Preparations and Commercial Forms

• Fresh plum fruit: Consumed raw as a whole fruit; peel and flesh are both edible.
• Dried plum (prunes): Some plum varieties are dried and are called prunes. Prunus domestica is used to produce prunes or fruit beverages (brandy and cocktail).
• Prune juice: Produced from dried plums, widely available as a beverage; important in clinical research on gastrointestinal health.
• Plum extract / powder: Concentrated forms used in nutraceutical and functional food applications.
• Jams and jellies: Prunus insititia is used specifically to make jams and jellies because of its relatively high pectin content.
• Fermented and alcoholic preparations: Plum wine and plum brandy (such as Slivovitz in Eastern Europe) are traditional fermented products.

The fruit is low in calories but contains nutrients like minerals, vitamins, and phytochemicals in profuse amounts.

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2. Traditional and Historical Use

China and East Asia

Prunus mume has been cultivated for more than three millennia with important edible, ornamental, and medicinal value. Due to its sour taste, the Prunus mume fruit (called Meizi in Chinese and Ume in Japanese) is not very popular compared to other fruits. According to literature reports, the application history of plum is more than 3,000 years in China. Chinese people value the ornamental and cultural purposes of the mei flower (ornamental forms of Prunus mume), while they adore the edible and medicinal value of mume plum or Meizi (for harvesting fruit).

In the early Shang and Zhou dynasties (about 1600–256 B.C.), Chinese people had already started to treat plum fruit as a condiment as important as salt. The tradition of consuming plum fruit has continued. The Romance of the Three Kingdoms recorded the allusion of quenching one's thirst upon thinking of plum fruit in the Eastern Han Dynasty (25–220 A.D.).

In Chinese medicine, plums are believed to have a cooling effect on the body and are used to treat various ailments, including fever and digestive issues. In Traditional Chinese Medicine, plum blossoms are used to help regulate stomach and spleen functions and to resolve respiratory issues.

Ayurveda and Unani Medicine (Indian Subcontinent)

Ayurveda and Unani medicine have always used plums and their components as a source of natural drugs and have extensively used them in the treatment of leucorrhoea, irregular menstruation, and miscarriage.

Ancient Mediterranean and Europe

The history of plums dates back thousands of years, with evidence of plum cultivation found in ancient civilizations such as China, Greece, and Rome. Plums were integrated into European dietary traditions as trade routes expanded, and their use as both food and folk medicine became established across the continent.

Traditional Use for Gastrointestinal Complaints

Dried plums (prunes) have been used traditionally for constipation, a use documented across multiple cultures and time periods. Multiple randomized trials and systematic reviews show that dried plums improve stool frequency and consistency in people with constipation and are at least as effective — and in some trials superior — to commonly used fiber supplements (e.g., psyllium). Thus the classical recommendation that prunes relieve stomach/heat-related complaints is compatible with evidence for a reproducible laxative/stool-softening action.

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3. Key Constituents and Active Compounds

Phenolic Acids

Plums are a potential source of polyphenolic compounds and bioactive compounds such as phenolics, anthocyanins, and carotenoids, and many organic acids such as citric acid and malic acid. Plums are also abundant sources of many minerals such as calcium, magnesium, phosphorus, potassium, and vitamins A, B, K, and C. The predominant antioxidant phenolic compounds include caffeic acid, chlorogenic acid, crypto-chlorogenic acid, and neo-chlorogenic acid.

Neo-chlorogenic acid and quercetin glycosides were found to be the predominant polyphenols in studied plum selections. Plums are notably rich in neochlorogenic acid, quercetin derivatives, and anthocyanins.

Epicatechin and neochlorogenic acid were the main free phenolics in plum, while catechin and epicatechin were the major bound phenolics. A total of 17 phenolic compounds have been identified, with epicatechin, neochlorogenic acid, and procyanidin B2 as the dominant compounds in the free phenolics fraction.

Anthocyanins

Plums show significantly higher total anthocyanin concentration (TAC), total phenolic content (TPC), and total antioxidant activity (TAA) compared to related stone fruits. Phenolic profiling revealed the distinctiveness of plums, particularly for neochlorogenic acid, quercetin-3-O-glucoside, quercetin-3-O-rutinoside, cyanidin-3-O-glucoside, and cyanidin-3-O-rutinoside. Neochlorogenic acid and the anthocyanins cyanidin-3-O-glucoside or -rutinoside are reported as the main phenolic compounds in cultivars with red skin or flesh. No anthocyanins are present in cultivars with yellow skin and flesh.

Flavan-3-ols and Proanthocyanidins

The major phenolic monomer compounds of plum polyphenols are flavan-3-ols (epicatechin, catechin, proanthocyanidin, and procyanidin B2), flavonols (myricetin), and phenolic acids (chlorogenic acid, ferulic acid, and protocatechuic acid).

Sorbitol

Dried plums contain significant amounts of sorbitol, quinic acid, chlorogenic acids, vitamin K1, boron, copper, and potassium. Synergistic action of these and other compounds, which are also present in dried plums in less conspicuous amounts, may have beneficial health effects when dried plums are regularly consumed. Prunes contain 15 g of sorbitol, the highest for any fruit product.

Organic Acids and Sugars

Glucose, fructose, malic acid, and quinic acid are the predominant contributors to sweetness and acidity in plums, with sucrose contributing more to the sweetness of the flesh than the peel. Plums contain higher levels of sorbitol, glucose, and fructose compared to related stone fruits such as peaches and nectarines.

Dietary Fiber and Pectin

The average total dietary fiber of plum fruit is 2.8 g/100 g. Pectin, being a source of dietary fiber, is also reported in most stone fruits, with plums containing 1% pectin. Whole prunes contain about 6 g of dietary fiber per 100 g, including pectin, which forms a gel-like substance that helps stools move through the intestines.

Carotenoids, Vitamins, and Minerals

Plums are important in human diet and health because of their sugar, organic acid, phenolic, anthocyanin, carotenoid, mineral, and amino acid contents. The abundant bioactive compounds of plum are phenolic acids, anthocyanins, carotenoids, minerals, and pectins.

Skin vs. Flesh Distribution of Phytochemicals

The peel contains 5.5-fold more phenolics than the flesh; epicatechin, gallic acid, and proanthocyanidins C1 and B2 were the primary sources of astringency. In studied cultivars, the total phenols, phenolic components, and antioxidant capacity were higher in the peel than in the pulp.

Effect of Drying on Phytochemical Composition

Anthocyanins, mostly cyanidin-3-rutinoside, were totally destroyed by drying, and so were catechins. The drying process therefore fundamentally alters the phytochemical profile; dried plums (prunes) retain chlorogenic acids, sorbitol, vitamin K, boron, and potassium, while losing heat-sensitive anthocyanins.

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4. Established and Proposed Mechanisms of Action

Antioxidant Mechanisms

Total phenolic concentration in plums was significantly correlated with total antioxidant capacity (TAC), with a correlation coefficient of R = 0.95 (P < 0.01). The total polyphenols of ripe plums exhibited strong antioxidant capacity, with IC50 values against DPPH and hydroxyl radicals of 28.19 ± 0.67 μg/mL and 198.16 ± 7.55 μg/mL, respectively.

After gastrointestinal digestion, the most bioaccessible phenolics were quercetin-pentoside (61.64%), cyanidin-3-O-glucoside (43.26%), and naringenin-7-O-β-D-glucoside (42.04%). The antioxidant capacity of both undigested plum and its digested fractions showed a positive correlation with total phenolics, and with specific individual phenolic compounds such as neochlorogenic acid, epicatechin, and procyanidin B2.

Anti-inflammatory Mechanisms

Dried plum (Prunus domestica L.) polyphenols demonstrate anti-inflammatory and antioxidative properties in macrophage RAW 264.7 cells. These polyphenols show strong anti-inflammatory and antioxidant properties against lipopolysaccharide (LPS)-induced production of the pro-inflammatory markers nitric oxide (NO) and cyclooxygenase-2 (COX-2), and the lipid peroxidation product malondialdehyde, in activated macrophage RAW 264.7 cells. This is an in vitro finding and does not directly confirm equivalent activity in humans.

Laxative / Gastrointestinal Mechanisms

Components found in the European plum, including the sugar alcohol sorbitol and phenolic compounds, may contribute to the laxative quality. The phenolic compounds are primarily chlorogenic and neochlorogenic acids, which are not readily absorbed in the small intestine and pass into the colon undigested. High sorbitol and fiber content, as well as polyphenols, explain the osmotic and bulking laxative effects.

Mechanisms Relevant to Bone Health

The beneficial effects of dried plums on bone health may be in part due to the variety of phenolics present in the fruit. Animal and cell studies suggest that dried plums and/or their extracts enhance bone formation and inhibit bone resorption through their actions on cell signaling pathways that influence osteoblast and osteoclast differentiation. These studies are consistent with clinical studies that show that dried plums may exert beneficial effects on bone mineral density (BMD).

Mechanisms Relevant to Lipid Metabolism

Besides fibers, polyphenolic compounds present in plums can, directly and independently, derive lipid-modulating impacts, and a possible synergistic empowerment could justify beneficial observations. Moreover, multiple cellular and/or experimental studies have suggested that the manipulation of bile acid (BA) metabolism is another possible way to explain the beneficial effects of plums on lipids. Proposed pathways include: augmentation of the expression of cholesterol 7-α-hydroxylase (CYP 7A1) — the enzyme active in bile acid production from cholesterol — through farnesoid X receptor (FXR), nuclear factor-kappa B (NF-κB), and extracellular-signal-regulated kinase (ERK) signaling pathways; reduced production of bile acid transporters in the gut lumen; hindering the enterohepatic circulation of bile acids by physical sequestration; and increasing the number of bacteria in the normal flora.

Xanthine Oxidase Inhibition

Plum polyphenols exhibited a strong inhibitory effect on xanthine oxidase (XOD), with an IC50 value of 77.64 μg/mL. The inhibition kinetics showed that plum polyphenols are mixed-type inhibitors that inhibit XOD activity and that the inhibition process is reversible. This finding is from an in vitro study and its relevance to human disease (e.g., gout) requires further investigation.

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5. Scientific Evidence by Area of Use

5.1 Gastrointestinal Health and Constipation

Evidence strength: Moderate to Strong (multiple RCTs and systematic reviews in humans)

The most robustly studied health application of plum/prune in clinical settings is the treatment of functional constipation. Subjects were enrolled in an 8-week, single-blind, randomized cross-over study. Subjects received either dried plums (50 g twice daily, fiber = 6 g/day) or psyllium (11 g twice daily, fiber = 6 g/day) for 3 weeks each, in a crossover trial with a 1-week washout period. Forty constipated subjects (male/female = 3/37, mean age = 38 years) participated. The number of complete spontaneous bowel movements per week (primary outcome measure) and stool consistency scores improved significantly (P < 0.05) with dried plums compared to psyllium. Straining and global constipation symptoms did not differ significantly between treatments. Dried plums and psyllium were rated as equally palatable and both were safe and well tolerated. Dried plums are safe, palatable, and more effective than psyllium for the treatment of mild to moderate constipation, and should be considered as a first-line therapy.

Bowel movement frequency doubled with 6 dried plums eaten twice daily, with improvements in stool consistency and constipation symptoms. Prunes are calorie dense; a dozen contain approximately 260 calories, though the glycemic index is low (10).

Multiple randomized trials and systematic reviews show that dried plums improve stool frequency and consistency in people with constipation and are at least as effective — and in some trials superior — to commonly used fiber supplements such as psyllium.

Limitations: The landmark Attaluri et al. (2011) trial enrolled only 40 subjects and was single-blind. Longer-term, larger, and double-blind trials are still needed. Prune juice (filtered, lower fiber) performs less consistently than whole dried plums in head-to-head comparisons.

5.2 Bone Health (Osteoporosis Prevention and Reversal)

Evidence strength: Moderate (multiple RCTs, one large 12-month RCT, and a 2026 systematic review/meta-analysis)

Among nutritional factors, recent observations suggest that dried plum, or prunes (Prunus domestica L.), is the most effective fruit in both preventing and reversing bone loss.

A 3-month clinical trial indicated that the consumption of dried plum daily by postmenopausal women significantly increased serum markers of bone formation — total alkaline phosphatase, bone-specific alkaline phosphatase, and insulin-like growth factor-I — by 12%, 6%, and 17%, respectively.

The "Prune Study," described as the largest and most comprehensive investigation of a dose response of prune consumption on bone health, biomarkers of immune function, inflammation, and cardiovascular health, as well as detailed phenolic and gut microbiota analyses in postmenopausal women, enrolled postmenopausal women between the ages of 55–75 years into either a control group (no prune consumption), a 50 g prune/day group, or a 100 g prune/day group. All participants received 1200 mg calcium + 800 IU vitamin D3 daily as standard of care. 235 women were randomized and 183 women completed the entire study.

Previously, prune consumption had preserved two-dimensional BMD at the total hip. The 12-month Prune Study further demonstrated that prune consumption preserved three-dimensional BMD and estimated strength at the tibia.

A 2026 systematic review and meta-analysis identified in PubMed, Scopus, and Web of Science eleven papers (747 participants) considered eligible. The effect of prune intervention in postmenopausal women was borderline significant at the lumbar spine, with BMD slightly higher in the intervention group.

Animal and cell studies suggest that dried plums and/or their extracts enhance bone formation and inhibit bone resorption through their actions on cell signaling pathways that influence osteoblast and osteoclast differentiation.

Limitations: Most clinical trials are conducted exclusively in postmenopausal women. Evidence in men remains sparse, though one study examined the effects of 12 months of consumption of 100 g dried plum (prunes) on bone biomarkers, density, and strength in men (published in Journal of Medical Food, 2022). The heterogeneity in study designs, dosages, populations, and outcome measures makes cross-study comparison difficult.

5.3 Cardiovascular Health and Lipid Profile

Evidence strength: Preliminary to Moderate (meta-analysis exists, but findings are mixed, and effect sizes vary substantially)

A systematic review and meta-analysis published in the Journal of Nutritional Science (2023) that searched electronic bibliographical databases for relevant randomized clinical trials and included nine eligible articles found that plum supplementation significantly improves total cholesterol levels in unhealthy individuals. Plum supplementation reduces LDL-c levels in the pooled sample (WMD = −11.52 mg/dL; 95% CI −21.93, −1.11, P = 0.03, I² = 98.7%), and also in some subgroups (dried plum, unhealthy subjects, duration more than 8 weeks). Although plum supplementation did not have any significant impact on serum levels of triglycerides or HDL-c, supplementation with plums is potentially effective in reducing serum total cholesterol and LDL-c.

In contrast, the 12-month Prune Study (a parallel-design RCT) found that prune supplementation at 50 g/day or 100 g/day did not alter markers of glycemic control and blood lipids after 12 months compared with the control group (all P > 0.05). Furthermore, gynoid percent fat and visceral adipose tissue (VAT) indices did not significantly differ in women consuming 50 g/day or 100 g/day prunes compared with the control group after 12 months of intervention.

Limitations: The meta-analysis on lipid profile showed extremely high heterogeneity (I² = 98.7%), meaning individual study results varied enormously. Effects were most apparent in individuals with pre-existing dyslipidemia and with interventions exceeding 8 weeks. The Prune Study (the largest and most rigorous single trial) found no significant lipid effects. Clinical relevance remains uncertain.

5.4 Antioxidant Capacity in Humans

Evidence strength: Preliminary (some human plasma data, limited mechanistic human trials)

There has been increased appreciation for plum among consumers owing to its superior nutrition and flavor, attractive colors, and natural antioxidant and anti-inflammatory functional components. Dietary polyphenols are associated with protection against chronic diseases such as cardiovascular disease. Pharmacological studies show a range of bioactivities and efficacy attributable to specific polyphenols. Evidence from in vitro studies is extensive; robust human interventional data specifically for plum/prune antioxidant effects on clinical endpoints remain limited.

5.5 Glycemic Control and Blood Glucose

Evidence strength: Weak to Preliminary (no strong human RCT evidence for therapeutic glycemic benefit)

Snacking on dried plums may increase satiety and reduce the subsequent intake of food, helping to control obesity, diabetes, and related cardiovascular diseases. Despite their sweet taste, dried plums do not cause a large postprandial rise in blood glucose and insulin. However, prune supplementation at 50 g/day or 100 g/day did not alter markers of glycemic control after 12 months compared with the control group (all P > 0.05) in the Prune Study. Plum bioactive compounds are reported to be effective in the treatment and prevention of gastrointestinal diseases, bone health, and cardiovascular diseases and in maintaining blood glucose level, but this is based largely on in vitro and animal data rather than confirmed human trials.

5.6 Anti-cancer Properties

Evidence strength: Very preliminary (in vitro and animal data only; no human clinical trial evidence)

Chlorogenic acid has been demonstrated to exhibit maximum antiproliferative activity on MDA-MB-468 human breast cancer cell line. A study was conducted to identify the phenolic fraction responsible for the potential chemopreventive and/or chemotherapeutic actions in plum. All extract fractions were found effective in exerting an antioxidant effect on studied cancer cell lines, with the flavonols and procyanidins more effective than the phenolic acids fraction. These findings are based on cell culture experiments; no human clinical evidence for anti-cancer efficacy currently exists for plum fruit supplementation.

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6. Body Systems and Health Areas Associated with Plum Fruit

• Gastrointestinal / Digestive System: Functional constipation relief; promotion of stool frequency and consistency; colon health via prebiotic fiber and polyphenols.
• Skeletal System: Preservation of bone mineral density; modulation of osteoblast/osteoclast signaling; bone biomarker improvement in postmenopausal women.
• Cardiovascular System: Potential LDL cholesterol and total cholesterol reduction (especially in dyslipidemic individuals); bile acid metabolism modulation.
• Metabolic / Endocrine System: Low glycemic index; potential role in blood sugar regulation (evidence limited to in vitro and animal models).
• Immune and Inflammatory Pathways: In vitro evidence for inhibition of pro-inflammatory markers (NO, COX-2); preclinical data on macrophage modulation.
• Antioxidant Defense: High polyphenol content; free radical scavenging capacity demonstrated in vitro and with human plasma measures.

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7. Dosage Forms and Dosages Reported in Studies

The following dosages are drawn directly from identified clinical studies and should not be interpreted as recommendations.

• Constipation (Attaluri et al., 2011 RCT): Dried plums 50 g twice daily (total 100 g/day, providing 6 g fiber/day) for 3 weeks in a crossover design.
• Bone health (Prune Study RCT): Postmenopausal women (ages 55–75) received either 50 g prune/day or 100 g prune/day for 12 months.
• Bone resorption / vascular function (crossover RCT): Twenty-seven healthy postmenopausal women were randomly assigned to consume six dried plums (~42 g) or two dried plums (~14 g) per day for 2 weeks, with a 2-week washout, then crossed over.
• 3-month bone formation trial: Consumption of dried plum daily by postmenopausal women produced significant changes in serum bone formation markers at doses studied. (Specific dose not reported in accessed abstract.)
• Bone health (general clinical range): Daily prune consumption commonly studied at 50–100 g/day (approximately 5–10 prunes).

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8. Safety Considerations and Interactions

Gastrointestinal Adverse Effects

Abdominal distension/pain and flatulence were the most common adverse events reported with fiber-based interventions and were mild to moderate in nature. The high sorbitol content of prunes is a particularly relevant safety consideration: sorbitol is a poorly absorbed sugar alcohol that exerts osmotic effects in the colon. At high doses, sorbitol can cause dose-dependent diarrhea, bloating, and cramping — particularly in individuals with irritable bowel syndrome (IBS). Dried plums were rated as well tolerated at the 100 g/day dose in the constipation RCT, but individual tolerance varies.

Vitamin K Content and Anticoagulant Drugs

Dried plums contain significant amounts of vitamin K1. Vitamin K, present in moderate amounts in prunes, may interfere with anticoagulant drugs such as warfarin (a vitamin K antagonist). Individuals on anticoagulant therapy who substantially change their intake of prunes could theoretically alter INR values; this interaction is based on the known mechanism of warfarin-vitamin K antagonism.

Potassium Content and Drug Interactions

Prune juice contains significant amounts of potassium, which can affect medications that influence potassium levels. Natural sorbitol and dietary fiber can alter gastrointestinal motility and absorption rates. The high potassium content can interact with medications such as ACE inhibitors or potassium-sparing diuretics, potentially leading to elevated potassium in the blood (hyperkalemia). Additionally, the laxative effect of sorbitol in prune juice may influence the absorption rate of oral medications by accelerating gastrointestinal transit time.

Caloric Density of Dried Plums

Prunes are calorie dense; a dozen contain approximately 260 calories, though the glycemic index is low (10). This is a relevant consideration for weight management in individuals consuming therapeutic quantities of dried plums.

Cardiometabolic Safety at Studied Doses

Prune supplementation at 50 g/day or 100 g/day for 12 months does not improve glycemic control and may prevent adverse changes in central adiposity in postmenopausal women, suggesting no worsening of cardiometabolic markers at these doses in the studied population.

Sorbitol and Drug Absorption

The laxative effect of sorbitol in prune juice may influence the absorption rate of oral medications by accelerating gastrointestinal transit time. This is a pharmacokinetic consideration particularly relevant when dried plums or prune juice are consumed concurrently with time-sensitive oral drug regimens.

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References

• Soluble sugar, organic acid and phenolic composition and flavor evaluation of plum fruits — PMC (2024)
• Plum (Prunus domestica): Morphology, Taxonomy, Composition and Health Benefits — Springer
• Plum (Prunus domestica): Morphology, Taxonomy, Composition and Health Benefits — ResearchGate (PDF)
• A comprehensive review on the availability of bioactive compounds, phytochemicals, and antioxidant potential of plum (Prunus Domestica) — Taylor & Francis (2023)
• Meizi-Consuming Culture That Fostered the Sustainable Use of Plum Resources in Dali of China — PMC (2022)
• Dried plum, an emerging functional food that may effectively improve bone health — PubMed (2009)
• Effects of Short-Term Dried Plum Intake on Markers of Bone Resorption and Vascular Function in Healthy Postmenopausal Women — PubMed (2019)
• Effects of Prunes on Bone Density in Humans: A Systematic Review and Meta-Analysis of Randomized Controlled Trials — Nutrients (2026)
• Prunes preserve cortical density and estimated strength of the tibia in a 12-month randomized controlled trial in postmenopausal women: The Prune Study — PubMed / Osteoporosis International (2024)
• Dried Plums, Prunes and Bone Health: A Comprehensive Review — PMC / Nutrients (2017)
• Rationale and study design of The Prune Study — PMC (2022)
• Randomised clinical trial: dried plums (prunes) vs. psyllium for constipation — PubMed / Alimentary Pharmacology & Therapeutics (2011)
• Systematic review: the effect of prunes on gastrointestinal function — Wiley / Alimentary Pharmacology & Therapeutics
• Dried Plums = Fiber for Chronic Constipation — American Academy of Family Physicians (2012)
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• Polyphenol Composition, Antioxidant Capacity and Xanthine Oxidase Inhibition Mechanism of Furong Plum Fruits — PMC (2023)
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• Polyphenol composition of plum selections in relation to total antioxidant capacity — PubMed (2012)
• Evidence for anti-inflammatory and antioxidative properties of dried plum polyphenols in macrophage RAW 264.7 cells — PubMed (2015)
• Dried Plums and Their Products: Composition and Health Effects — ResearchGate (2013)
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